Alex Cross – psychologist, single father, homicide detective – confronts two vicious killers. His old foe has escaped from prison and, dying from AIDS, is gunning for Cross. He may kill thousands more along the Eastern Seaboardwhile he's at it. And a new murderer leaves a bloody trail of corpses across Europe. As the investigation progresses, a question emerges: who is the cat and who the mouse? Fourth in the series.